I phoned back and was put in a queue so I'm guessing it's telemarketing

scammer ....play with them like I did. they claim to be solar. But did not provide actual benefits to consumers - have fun :)

Caller: “Solar rebates”

Someone spruiking saving money due to solar rebates. Guaranteed scam.

Caller: Telemarketers

Trying to sell solar panels - told them I was on the "Do Not Disturb Register" said they had no idea what that was.

I called this number back from a landline and they said only "Hello?" when they first answered and when I asked which business was it that I had called the person answered "Business Operations Solutions" and stated that the Federal Government were soon offering a rebate for energy costs and they could assist with an almost 80% rebate. I said thanks but no thanks as they sound suspicious and said goodbye.